Air cylinder



FIG. 1 shows a front view of an air cylinder showing my new design;

FIG. 2 shows a back view thereof;

FIG. 3 shows a top view thereof;

FIG. 4 shows a bottom view thereof;

FIG. 5 shows a left side view thereof; and,

FIG. 6 shows a right side view thereof. 

The ornamental design for an air cylinder, as shown and described. 